Anti-deviation cast film belt cleaning device

The utility model relates to an anti-deviation cast film belt cleaning device which is characterized in that a belt unwinding roller is arranged on one end side of a base frame, a belt winding device is arranged on the other end side of the base frame, the belt winding device comprises a base, a bracket and a belt winding roller, the base and the base frame are fixedly arranged on the ground, the base is provided with a driving gear, the bracket is provided with a rack, and the driving gear is matched with the rack; the driving gear drives the bracket to move through the rack, the belt winding roller is arranged on the bracket, the belt unwinding roller faces the belt winding roller, and a first tensioning module, a first cleaning device, an offset detection device and a second tensioning module are sequentially arranged between the belt unwinding roller and the belt winding roller and located on the base frame. And the offset detection device is electrically connected with the driving gear through the contro